6421938769 has 9 divisors (see below), whose sum is σ = 6483177801. Its totient is φ = 6361275060.

The previous prime is 6421938739. The next prime is 6421938799. The reversal of 6421938769 is 9678391246.

The square root of 6421938769 is 80137.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6421938739) and next prime (6421938799).

It is not a de Polignac number, because 6421938769 - 2¹³ = 6421930577 is a prime.

It is a super-2 number, since 2×6421938769² = 82482595105570470722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421938739) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10177084 + ... + 10177714.

It is an arithmetic number, because the mean of its divisors is an integer number (720353089).

Almost surely, 2^6421938769 is an apocalyptic number.

6421938769 is the 80137-th square number.

6421938769 is the 40069-th centered octagonal number.

It is an amenable number.

6421938769 is a deficient number, since it is larger than the sum of its proper divisors (61239032).

6421938769 is an frugal number, since it uses more digits than its factorization.

6421938769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516 (or 758 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The cubic root of 6421938769 is about 1858.7545878198.

The spelling of 6421938769 in words is "six billion, four hundred twenty-one million, nine hundred thirty-eight thousand, seven hundred sixty-nine".